22" x 16" Cube Core Eggcrate Return Air Filter Grille for 1" Filter w8h8 + Product Details Perfect Fit

+ Product Details Perfect Fit & Easy Sizing - Designed for a 18" x 36" OR 36" x 18" duct opening (measured at the opening)

but still very thin

+ Product Details Size – 22" x 30" or 30" x 22" is the size for the duct opening measurement only

+ Product Details Perfect Fit & Easy Sizing - Designed for a 6" x 16" or 16" x 6" duct opening (measured at the opening)

5" Wide x 12" Tall x 2

22" x 16" Cube Core Eggcrate Return Air Filter Grille for 1" Filter w8h8 + Product Details Perfect Fit+ Product Details Perfect Fit & Easy Sizing Designed for a 22" x 16" OR 16" x 22" duct opening (measured at the opening), with actual outer dimensions of 24. 5" W x 18. 5" H. Please check the measuring guide to ensure a proper fit. Filter Size 21. 75" x 15. 75" x 1" Premium Airflow Efficiency High performance cube core eggcrate design allows 95% airflow efficiency, reducing energy costs and maximizing HVAC system lifespan. Durable, Rust Free Aluminum